From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- .../ui/regions/regions-trait-object-subtyping.rs | 26 ++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 src/test/ui/regions/regions-trait-object-subtyping.rs (limited to 'src/test/ui/regions/regions-trait-object-subtyping.rs') diff --git a/src/test/ui/regions/regions-trait-object-subtyping.rs b/src/test/ui/regions/regions-trait-object-subtyping.rs new file mode 100644 index 000000000..1d7a766de --- /dev/null +++ b/src/test/ui/regions/regions-trait-object-subtyping.rs @@ -0,0 +1,26 @@ +trait Dummy { fn dummy(&self); } + +fn foo1<'a:'b,'b>(x: &'a mut (dyn Dummy+'a)) -> &'b mut (dyn Dummy+'b) { + // Here, we are able to coerce + x +} + +fn foo2<'a:'b,'b>(x: &'b mut (dyn Dummy+'a)) -> &'b mut (dyn Dummy+'b) { + // Here, we are able to coerce + x +} + +fn foo3<'a,'b>(x: &'a mut dyn Dummy) -> &'b mut dyn Dummy { + // Without knowing 'a:'b, we can't coerce + x + //~^ ERROR lifetime may not live long enough +} + +struct Wrapper(T); +fn foo4<'a:'b,'b>(x: Wrapper<&'a mut dyn Dummy>) -> Wrapper<&'b mut dyn Dummy> { + // We can't coerce because it is packed in `Wrapper` + x + //~^ ERROR lifetime may not live long enough +} + +fn main() {} -- cgit v1.2.3